<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>tabledemo</title>
    <style>
        .yellow{
            background-color: yellow;
        }
    </style>
</head>
<body>
    <table border = "1">
        <tr>
            <th>用户名</th>
            <th>用户地址</th>
            <th>联系电话</th>
        </tr>
        <tr class = "yellow">
            <td>张三</td>
            <td>北京</td>
            <td>137777777</td>
        </tr>
        <tr>
            <td>李四</td>
            <td>东京</td>
            <td>137777777</td>
        </tr>
        <tr>
            <td>王五</td>
            <td>南京</td>
            <td>137777777</td>
        </tr>

    </table>

</body>
</html>